I spend a bit of time in the elements, from wheeling to camping to skiing and snowshoeing. I use wool socks (Darn Tough or something like that), Columbia snow boots for camping/ snowshoeing, merino wool long underwear, snow pants from Level 9 (I dont recall the brand), and sometimes fleeced lined Jeans from Cabelas.
Up top I layer a long sleeve shirt, a fleece jacket, and a waterproof shell. My shell is Columbia, but depending on how cold it is I have a Salomon waterproof thin coat I can put over layers to stay warm, or I can wear my Columbia if it is really cold.
I have half a dozen or so beanies since I'm bald. I wear whatever is in the car. For gloves I have Dakine mittens with fleece finger glove liners. If it's super cold I'll throw a hand warmer into the mittens. I wear a buff/head sock over my face to keep some warmth and limit exposed skin. I recently bought a velcro bandana from Oakley that I'll test this winter.
The coldest I've ever camped was at FYTO 3 years ago. I wore lots of layers and stayed mostly warm. It was freaking COLD, but a good time. Too many layers and it feels like Randy from A Christmas Story...?